Java - Rotating array

Question

So the goal is to rotate the elements in an array right a times. As an example; if a==2, then array = {0,1,2,3,4} would become

Answer 1

I think the fastest way would be using System.arrayCopy() which is native method:

int[] tmp = new int[a];
System.arraycopy(array, array.length - a, tmp, 0, a);
System.arraycopy(array, 0, array, a, array.length - a);
System.arraycopy(tmp, 0, array, 0, a);

It also reuses existing array. It may be beneficial in some cases. And the last benefit is the temporary array size is less than original array. So you can reduce memory usage when a is small.